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I'm considering Potenza S-03PP 255-40-18 for the rear 2 only (the fronts are still fine).

Has anyone done this?

Doing the math: The 255-40's are only 16mm taller than my current tires, but are 25.5mm taller than 255-35's (which are, of course, the "max" recommended OEM's and would fit great - but they're 25.5-16=almost 10mm shorter than what I have up front - may look funny?).

The height difference is negligable, running 255/35R18 rear with 235/40R18 front is pretty common amoung E46Fanatics members. If the height difference is a large concern, you can always go back to 225/40R18 on the front.

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